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【单选题】
St. Petersburg, the very name brings to mind some of Russia’s greatest poets, writers and composers: Pushkin, Dostoevsky, Tchaikovsky. The 19th century was a golden age for St. Petersburg’s wealthy classes. It was a world of ballets and balls, of art and literature, of tea and caviar. The golden age ended with the advent of World War I. Working people were growing more and more discontented. In 1917, Communism came, promising peace and prosperity. St. Petersburg had become Petrograd in 1914. People wanted a Russian name for their city. Ten years later, the city’s name changed again, this time to Leningrad. Then in 1991, Leningraders voted to restore the city’s original name. Some people opposed the name change altogether. Others thought it was just too soon. Old, run-down Soviet Leningrad, they said, was not the St. Petersburg of 19th-century literature. What, then, is St. Petersburg? In the confusing post-Communist world, no one really knows. The quiet, if Soviet-style, dignity is gone. The Communist sayings are down and gaudy advertising up. Candy bars and cigarettes are sold from boxy, tasteless kiosks. And clothing? Well, anything goes. Everyone wants to be a little different. But many people do not know the true meaning of freedom. Personal crime has gone up, up, up in the past few years. Yet in spite of this, you can still find some of the city’s grand past. Stand at the western tip of Vasilievsky Island. To the fight is the elegant Winter Palace, former home of the czars. Its light blue sides and white classical columns make it perhaps St. Petersburg’s most graceful building. It houses one of the world’s most famous art museums: the Hermitage. Inside, 20km of galleries house thousands of works of art. Look over your right shoulder. The massive golden dome of St. Isaac’s Cathedral rises above the skyline. You’ll see, too, why St. Petersburg is called a 'floating city.' Standing there, nearly surrounded by water, you can see four of the city’s 42 islands. Cross the bridge and turn behind the Winter Palace. In the middle of the huge Palace Square stands the Alexander Column. It commemorates Russia’s victory over Napoleon. The 650-ton granite column is not attached to the base in any way. Its own weight keeps it upright. Hoisted into place in 1832, it has stood there ever since. Continue to Nevsky Prospekt, the heart of the old city. Let the crowds hurry by while you take your time. Admire the fine carving on bridges and columns, above doorways and windows. Cross over canals and pass by smaller palaces and other classical structures. Let your eyes drink in the light blues, greens, yellows and pinks. Take time to wander among Kazan Cathedral’s semi circle of enormous brown columns. Or, if you prefer Russian-style. architecture, cross the street and follow the canal a short distance. The Church of the Resurrection occupies the site where Czar Alexander Ⅱ was assassinated in 1881. Travel outside the city to Petrodvorets Palace for a taste of old imperial grandeur. After a visit to France in the late 17th century, Peter the Great decided to build a palace for himself better than Versailles. His dream never came true in his lifetime. It took almost two centuries to complete the palace and park complex. Seldom does any city have the chance to reinvent itself. That chance has now come to St. Petersburg. A few people might hope to return to the glory of the past, but most know that is impossible. They want to preserve the best of past etas and push ahead. You can bet the city won’t be old St. Petersburg, but something altogether different. In 1935, St. Petersburg was called
A.
St. Petersburg.
B.
Petrograd.
C.
Leningrad.
D.
Vasilievsky.
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【多选题】精基准的选择原则是()。
A.
“基准重合”原则
B.
“基准统一”原则
C.
“自为基准”原则
D.
“互为基准”原则
E.
定位准确,夹紧可靠,操作方便
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A.
负 责 对危机事件管理决策
B.
内外沟通联络
C.
为 媒 介准备材料
D.
预测危机
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A.
正确
B.
错误
【判断题】机器人控制系统主要对机器人工作过程中的动作顺序、应到达的位置及姿态、路径轨迹及规划、动作时间间隔,以及末端执行器施加在被作用物上的力和力矩等进行控制。 ( )
A.
正确
B.
错误
【多选题】精基准的选择原则是什么?
A.
基准重合原则
B.
基准统一原则
C.
自为基准原则
D.
互为基准原则
E.
保证工件定位准确、夹紧可靠、操作方便的原则。
【多选题】笼型异步电动机定子电压为额定频率下的额定电压带负载运行,( )。
A.
功率因数可能超前、也可能滞后
B.
功率因数一定滞后
C.
功率因数一定超前
D.
从电源吸收有功功率
E.
功率因数很高
【简答题】______ 是NURBS 曲线的一种,绘制的点将被约束在曲线上。
【判断题】机器人控制器一般安装于机器人电柜内部,控制机器人的伺服驱动器、输入输出等主要执行设备;机器人示教器一般通过电缆连接到机器人电柜上,作为上位机通过以太网与控制器进行通讯。
A.
正确
B.
错误
【多选题】1906年日俄战争中日本得手,从沙俄手中攫得强租自中国的( )的铁路及其他权益。
A.
哈尔滨
B.
旅顺口
C.
大连湾
D.
长春至旅顺口
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